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<td> <div>定义于头文件 <code>&lt;stdatomic.h&gt;</code>
 </div></td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c">C atomic_fetch_add<span class="br0">(</span> <span class="kw4">volatile</span> A<span class="sy2">*</span> obj, M arg <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td> <span class="t-mark-rev t-since-c11">(C11 起)</span> </td>
</tr>
<tr class="t-dcl t-since-c11">
<td> <div><span class="mw-geshi c source-c">C atomic_fetch_add_explicit<span class="br0">(</span> <span class="kw4">volatile</span> A<span class="sy2">*</span> obj, M arg, <a href="memory_order.html"><span class="kw910">memory_order</span></a> order <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td> <span class="t-mark-rev t-since-c11">(C11 起)</span> </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>以 <code>arg</code> 和 <code>*obj</code> 的旧值的加法结果原子地替换 <code>obj</code> 所指向的值，并返回 <code>*obj</code> 先前保有的值。此操作是读修改写操作。第一版本按照 <span class="t-lc"><a href="memory_order.html" title="c/atomic/memory order">memory_order_seq_cst</a></span> 排序内存访问，第二版本按照 <code>order</code> 排序内存访问。
</p><p>这是为所有<a href="../language/atomic.html" title="c/language/atomic">原子对象类型</a> <code>A</code> 定义的<a href="../language/generic.html" title="c/language/generic">泛型函数</a>。参数为指向 volatile 原子对象的指针，以接受非 volatile 与 <a href="../language/volatile.html" title="c/language/volatile">volatile</a> （例如内存映射 I/O ）的原子对象，而 volatile 语义在应用此操作时保留。 若 <code>A</code> 为原子整数类型则 <code>M</code> 是对应 <code>A</code> 的非原子类型，或若 <code>A</code> 为原子指针类型则 <code>M</code> 为 <span class="t-lc"><a href="../types/ptrdiff_t.html" title="c/types/ptrdiff t">ptrdiff_t</a></span> 。
</p><p>泛型函数名是宏或是声明有外部链接的标识符是未指定的。若为访问实际函数压制宏定义（例如像 <span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span>atomic_fetch_add<span class="br0">)</span><span class="br0">(</span>...<span class="br0">)</span></span></span> 这样加括号），或程序定义拥有泛型函数名的外部标识符，则行为未定义。
</p><p>对于有符号整数类型，定义算术为使用补码表示。无未定义结果。对于指针类型，结果可能是未定义地址，但运算不会另有未定义行为。
</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  obj
</td>
<td> -
</td>
<td>  指向要修改的原子对象的指针
</td></tr>
<tr class="t-par">
<td>  arg
</td>
<td> -
</td>
<td>  要加到存储于原子对象中的值的值
</td></tr>
<tr class="t-par">
<td>  order
</td>
<td> -
</td>
<td>  此操作的内存同步顺序：容许所有值
</td></tr></table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
<p><code>obj</code> 所指向的原子对象先前保有的值。
</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">运行此代码</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="c source-c"><pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;threads.h&gt;</span>
<span class="co2">#include &lt;stdatomic.h&gt;</span>
 
<a href="../atomic.html"><span class="kw963">atomic_int</span></a> acnt<span class="sy4">;</span>
<span class="kw4">int</span> cnt<span class="sy4">;</span>
 
<span class="kw4">int</span> f<span class="br0">(</span><span class="kw4">void</span><span class="sy2">*</span> thr_data<span class="br0">)</span>
<span class="br0">{</span>
    <span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> <span class="nu0">1000</span><span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <span class="br0">{</span>
        atomic_fetch_add_explicit<span class="br0">(</span><span class="sy3">&amp;</span>acnt, <span class="nu0">1</span>, <a href="memory_order.html"><span class="kw911">memory_order_relaxed</span></a><span class="br0">)</span><span class="sy4">;</span> <span class="co1">// 原子的</span>
        <span class="sy2">++</span>cnt<span class="sy4">;</span> <span class="co1">// 未定义行为，实际上会失去一些更新</span>
    <span class="br0">}</span>
    <span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
    <a href="../thread.html"><span class="kw994">thrd_t</span></a> thr<span class="br0">[</span><span class="nu0">10</span><span class="br0">]</span><span class="sy4">;</span>
    <span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span>
        <a href="../thread/thrd_create.html"><span class="kw995">thrd_create</span></a><span class="br0">(</span><span class="sy3">&amp;</span>thr<span class="br0">[</span>n<span class="br0">]</span>, f, <a href="../types/NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="sy4">;</span>
    <span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> <span class="nu0">10</span><span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span>
        <a href="../thread/thrd_join.html"><span class="kw1002">thrd_join</span></a><span class="br0">(</span>thr<span class="br0">[</span>n<span class="br0">]</span>, <a href="../types/NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span><span class="sy4">;</span>
 
    <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"The atomic counter is %u<span class="es1">\n</span>"</span>, acnt<span class="br0">)</span><span class="sy4">;</span>
    <a href="../io/fprintf.html"><span class="kw851">printf</span></a><span class="br0">(</span><span class="st0">"The non-atomic counter is %u<span class="es1">\n</span>"</span>, cnt<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div></div>
<p>可能的输出：
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">The atomic counter is 10000
The non-atomic counter is 9511</pre></div></div> 
</div>
<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
<div class="t-ref-std-11">
<ul><li> C11 standard (ISO/IEC 9899:2011): 
</li></ul>
<dl><dd><ul><li> 7.17.7.5 The atomic_fetch and modify generic functions (p: 284-285)
</li></ul>
</dd></dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div"><div><a href="atomic_fetch_sub.html" title="c/atomic/atomic fetch sub"> <span class="t-lines"><span>atomic_fetch_sub</span><span>atomic_fetch_sub_explicit</span></span></a></div><div><span class="t-lines"><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div></div>
</td>
<td>   原子减法  <br> <span class="t-mark">(函数)</span> </td></tr>

</table>

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